1. Use fresh economically, or there will be a shortage of water in a few decades.
=> If you don't........,there will be a shortage of water in a few decades.
2. The bus was late, so Lan was late for school
=> Lan was late for......was late.
3. "Let's keep the air unpolluted", the Town President said.
=> The Town President suggested that.........the air unpolluted.
4. I like painting.It is in this room
=> I like the painting.......room.
1. If you don't use fresh economically, there will be a shortage of water in a few decades
2. Lan was late for school because the bus was late
3. The Town President suggested that we keep the air unpolluted
4. I like the painting which is in this room
